Abstract
For future high speed indoor wireless communication, diffuse wireless optical communications offer more robust optical links against shadowing than line-of-sight links. However, their performance may be degraded by multipath dispersion arising from surface reflections. We have developed a multipath diffusive propagation model capable of providing channel impulse responses data. It is aimed to design and simulate any multibeam transmitter under a variety of indoor environments. In this paper, a multi-beam transmitter system associated with hemisphere structure is proposed to fight against the diverse effects of multipath distortion albeit, at the cost of increased laser power and cost. Simulation results of multiple impulse responses showed that this type of multi-beam transmitter can significantly improve the performance of BER suitable for high bit rate application. We present the performance and simulation results for both line-of-sight and diffuse link configurations. We propose a design of power radiation pattern for a transmitter in achieving uniform and full coverage of power distributions for diffuse indoor optical wireless systems.
Highlights
In recent years, the development of indoor optical wireless communication system has received great attention due to its capability for future high speed and flexible optical communications at low cost [1,2,3,4,5,6,7,8,9,10,11]
In LOS link system, optical carrier from the transmitter reaches the receiver directly, while in non-LOS link system, an optical carrier reaches the receiver after some diffusive reflections by the ceiling and/or walls in the room
Nondirected non-LOS links, known as diffuse links, where the optical carrier is reflected diffusively to omnidirection and fills the whole room can avoid the need for aiming the transmitter and provide robustness against shadowing due to the blockage, but suffer from increased path loss and data-rate limitation caused by multipath reflections
Summary
The development of indoor optical wireless communication system has received great attention due to its capability for future high speed and flexible optical communications at low cost [1,2,3,4,5,6,7,8,9,10,11]. The simulation results show that higher-order reflections are still significant for both configurations and their power distributions have a wide angle range of coverage (∼180 degrees) within a short duration time of 50 ns.
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